I'm very disappointed by the reviews I've seen so far. I think they can be broken into two very different views: 1) This is a low budget movie and should have done better, and 2) I'm a guitar player and the guitar playing and depiction Jimi's life were incomplete.
Okay, I think I can address those all at once: It wasn't a move for guitarists, and being a low budget movie, they couldn't possibly cover every aspect of the man's life.
What they chose to cover, I believe, was very substantial and important. Being a guitarist myself, I'm not disappointed in Wood's performance. Was his "guitar playing" perfect? No, he's an actor, not a guitarist. Nevertheless, the movie was very well done, Wood did an amazing job of portraying the character of Hendrix, and the story told a great deal of Jimi's early life in music. The latter part, I think, is probably what bothered most, as it didn't go into enough details about his demise.
I think it's unfair to put down the movie for that. I don't think that's where the writers and directors were focusing. They were concentrating on his early music career and I think they did it brilliantly. I found it entirely engrossing and having seen it three times, I'll watch it a fourth.
If you're not a Hendrix fan, but you're curious about his early career, I think this movie is just for you. I won't guarantee that it's entirely accurate, but it's close enough to satisfy me, and the acting and music are exceptional.